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Magnetism and Electromagnetism

Magnetism and Electromagnetism
In the left hand rule, forefinger always represents

magnetic field
Voltage
direction of force on the conductor
current

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Magnetism and Electromagnetism
For a given wire-wound core, an increase in current through the coil

Decreases the flux density
Reverses the flux lines
Causes no change in flux density
Increases the flux density

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Magnetism and Electromagnetism
Which of the following materials are diamagnetic?

Copper
Silver and copper
Silver
Iron

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Magnetism and Electromagnetism
If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density

doubles
increases
remains the same
decreases

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Magnetism and Electromagnetism
A permeable substance is one

which is a good conductor
which is a bad conductor
through which the magnetic lines of force can pass very easily
which is a strong magnet

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Magnetism and Electromagnetism
What is the mmf of a wire with 8 turns carrying three amperes of current?

0.24 AT
24 AT
2.4 AT
240 AT

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MORE MCQ ON Magnetism and Electromagnetism

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